John S. Hodgson

Dodson “Dot” Marrs

Dodson Marrs worked in carpentry and concrete work at Oak Ridge, Tennessee as a part of the Manhattan Project.

Helena Calloway

Helena Calloway was a laboratory assistant in the Chemistry Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

James Downey

James Downey was a laboratory helper at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

L. S. Carnahan